Crossword Genius

Stages crafts or cycles (6)

Ross

I believe the answer is:

rostra

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'stages' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rostra that I've seen before include "where they make their speeches?" , "The beaks" , "Raised platforms" , "stages" .)

I've seen this clue in the Sydney Morning Herald.
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